Your life in 400 free calculators

An example - Density Calculator
Calculate density
cu ft
lb/cu ft
Lookup density
Material category
lb/cu ft
Will it float in fresh water?
Nope, it's gonna sink.
About us

Physics is what drives the world around us: it's the language that explains the most basic laws of nature. Why do things fall when we drop them? How come ice cubes float in fresh water? How much power does a rocket need to go into space? Behind each such question, there's numerical data and a formula that uses it.

At CalcTool, we aim to provide you with the answer without the need to remember the equations, no matter if you're checking your homework or satisfying your natural curiosity.

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The most popular calculators

Parallel resistor

Use this parallel resistor calculator to find the equivalent resistance of resistors in a parallel circuit or find a resistor value that will complete a required total resistance.


Use our wavelength calculator and find the wavelength, speed, or frequency of any light or sound wave.


This momentum calculator finds the linear momentum of an object given its mass and velocity.

Potential energy

The potential energy calculator finds the gravitational potential energy of an object at a certain height.


The acceleration calculator is a tool dedicated to solving the value of acceleration using various methods.

Gear ratio

Gear up! With our gear ratio calculator, you will learn how gear trains work, and how to calculate speed and torque for any pair of cogwheels.


Our density calculator will guide you in a short exploration of this property of matter, while helping you calculate it for a generic object or for some selected materials.

Ideal gas law

Most gasses act very close to the prediction of the ideal gas law calculator which bases on the equation PV=nRT.


The enthalpy calculator lets you find the enthalpy change in a chemical reaction.


The work calculator finds this physical quantity using force and displacement or velocity change.

Specific heat

This specific heat calculator finds the specific heat, energy, or temperature change of many substances.

Dew point

The dew point calculator finds the dew point of the air, using its temperature and relative humidity.
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